Heat bonding

Fabric-backed sheets of almost all fluoropolymers, whether perfluorinated or partially fluorinated, can be purchased for lining equipment. Several companies offer these product including Electrochemical Engineering and Manufacturing, SYMAEIT and Allied Supreme Corp.l  

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As a tme thermoplastic, FEP copolymer can be melt-processed by extmsion and compression, injection, and blow molding. Films can be heat-bonded and sealed, vacuum-formed, and laminated to various substrates. Chemical inertness and corrosion resistance make FEP highly suitable for chemical services its dielectric and insulating properties favor it for electrical and electronic service and its low frictional properties, mechanical toughness, thermal stabiUty, and nonstick quaUty make it highly suitable for bearings and seals, high temperature components, and nonstick surfaces. 

Fig. 2. Photomicrographs of geotextiles made by various methods (a) woven geotextile, (b) needle-punched, (c) heat-bonded, and (d) resin-bonded.

Covers for the battery designs in Figures 1 and 2 are typically molded from materials identical to that of the respective case, and vent plugs are frequentiy made of molded polypropylene. Other combinations are possible, eg, containers molded of polyethylene or polypropylene may be mated with covers of high impact mbber for use in industrial batteries. After the cover is fitted over the terminal post, it is sealed onto the case. The cover is heat bonded to the case, if it is plastic it is sealed with an epoxy resin or other adhesive, if it is vulcanized mbber. Vent caps are usually inserted into the cover s acid fiU holes to faciHtate water addition and safety vent gasses, except for nonaccessible maintenance-free or recombinant batteries. In nonaccessible batteries, the vent is fabricated as part of the cover. 

TPEs can be bonded to other materials by adhesive, heat bonding, electromagnetic filling, radio frequency, heat-sealing lamination, friction and spin welding, and ultrasonic welding. For TPUs, the most widely used techniques are radio frequencies, and ultrasonic and hot stamping. A few typical applications include football bladders, valves, and conveyer belts. 

Heat-bonding process Glass fiber mat is embedded into the exterior surface of the pipe liner. This serves as an adhesion key for the reinforcement resin. This is an expensive process owing to the necessity for strict control over the surface fusion process. 

Heat bonding is of two types nodulization in which material is tumbled while heated to give hard rounded granules and sintering in which the product is an integrated mass that is subsequently broken to size. 

In the manufacture of electronics components such as vacuum tubes or light bulbs, brazing (a process in which materials are heat-bonded) is carried out either in a hydrogen atmosphere or in nonreactive gases (such as argon or nitrogen) to prevent oxidization. 

Using heat to fuse particulate solids into a lomerates. (See also heat bonding, sintering.)... 

To form a piece by employing a model (TEMPLATE). Using heat to fuse PARTICULATE solids into AGGLOMERATES. (See also HEAT BONDING, SINTERING). 

Epitaxial growth of polysilicon Manufacture of vacuum tubes, light bulbs Heat bonding of materials ( brazing )... 

Film Processing Methods Fluorinated ethylene-propylene resins are processed by conventional melt-extrusion techniques. Films may be thermoformed, vacuum-formed, heat-sealed, heat-bonded, welded, metallized, or laminated. 

Characteristics (zero cure time) (A + H = air + heat bond) (Chem = chem bond) ... 

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